Photovoltaic Power Generation in Guanzhong Region of Shaanxi Province and Investment Analysis of Individual Home-installed Grid-connected Projects

The solar radiation intensity in Shaanxi is high from north to south, and the radiation gradient is decreasing. Guanzhong area is China's more solar energy-rich areas, lower than northern Shaanxi and higher than southern Shaanxi, divided into three categories of solar energy resources according to photovoltaic policy. According to the "National Development and Reform Commission's Notice on Exploiting Price Leverage to Promote the Healthy Development of the Photovoltaic Industry" issued by the National Development and Reform Commission on August 26, 2013 (Development and Reform Price [2013] No. 1638), the implementation of distributed photovoltaic power generation is based on The electricity subsidy policy, the electricity price subsidy standard is 0.42 yuan per kilowatt-hour, the benchmark online electricity price is 1 yuan per kilowatt-hour.

The Guanzhong area in Shaanxi is suitable for solar power generation. Due to the promotion of national and local policies, the government and industrial and commercial enterprises and individual houses have installed solar power grid-connected power generation projects with strong growth momentum.

I. Annual output of roof photovoltaic grid-connected systems

Xianyang City is adjacent to Xi’an City. Solar radiation in the urban area is basically the same as Xi’an. This project is installed on the roof of the plant at an angle of 27 degrees at the best elevation angle, and the power is 28kwp. After converging through the combiner box, it is connected to a 30wp centralized inverter (including isolation transformer). After the three-phase output, the grid-connected metering cabinet is transmitted to the cable. One hundred meters of power distribution room has a low-voltage circuit that goes online to the low voltage bus.

Photovoltaic grid-connected time is December 2011 (calculation of power generation, etc. in the table and after are calculated according to the first full year), and the initial power generation amount is 31,572 degrees after grid-connected. The monthly power generation amount is shown in the table below, according to the whole system. With an efficiency of 0.8, the relevant data is as follows (some people regularly clean the surface of photovoltaic modules during the operation of the system):

The average daily generating capacity of photovoltaic grid-connected grids is 86.5 degrees;

Photovoltaic grid-connected annual power generation capacity of 1.128 degrees per year

The average daily peak hours for the whole year is 3.9 (27 degrees in Xianyang).

The power generation data for running the three-year statistics are:

The total amount of electricity generated during the three years of operation is 94,679 degrees. Based on this calculation, the average annual power generation per watt over the three-year period is 1.127 degrees. Compared with the first year of power generation, it was basically flat and the system attenuation was not obvious.

According to the analysis of meteorological data in the Guanzhong region, solar radiation in Guanzhong West (Baoji City), Guanzhong East (Weinan City) and Guanzhong North (Tongchuan City) is higher than Xi'an and Xianyang, and there are significant differences, so the power generation in Xianyang City The amount should be understood as the lower limit value of electricity generation in the Guanzhong area. The photovoltaic grid-connected roof projects installed under normal circumstances are installed at the best elevation angle. When a professional new energy company conducts system and installation design, its power generation capacity should be between 1.1 and 1.25 kwh per watt.

II. Installed capacity and investment amount of individual home-installed grid-connected systems

Guanzhong is located in the area west of Shaoguan, Shaanxi Province and east of Baoji, namely Xian, Tongchuan, Baoji, Xianyang, Weinan, and Yangling districts. With a fertile land, rivers and rivers, and a mild climate, Guanzhong is known as the “Golden River of 800 Counties”. It is well-developed in agriculture and industry and has a dense population. It is a land of wealth in Shaanxi. Thanks to the state's subsidies and promotion policies, many Guanzhong and affluent farmers have turned their sights on photovoltaic power generation, invested tens of thousands of yuan, and used idle roofs as a kind of assured and stable investment and financing method that suits them well.

According to the actual conditions of the individual residential roofs in Guanzhong, the power of solar power modules installed by a single household is between 3 and 10 kw. The current market cost is slightly different depending on the selection of major equipment. In accordance with Xi'an Powerway's use of Yingli's polycrystalline modules and supporting inverters, its unit price per watt is approximately 8-9 yuan. If you install 5KW, you need to invest about 4 to 45,000 yuan. The smaller the installed capacity, the slightly higher unit price.

Qualified farmers can use the design of a professional photovoltaic company to install the foundation and support itself. New Energy provides installation guidance, electrical installation, and grid connection services. This will reduce the system cost to a certain extent, and investment will be reduced.

Third, government subsidies and investment payback period

1, the provincial subsidy policy. Based on the country's distributed policies, the Shaanxi Provincial Government issued the “Opinions on Promoting the Implementation of Distributed Photovoltaic Power Generation by Demonstration” (Shan Zheng Fa (2014) No. 37) in December 2014. For three consecutive years, a one-off subsidy for distributed PV power plant construction will be provided at a rate of one yuan per watt per year according to a standard of 100MW per year. At the same time, cities and counties will be encouraged to arrange funds to subsidize photovoltaic power generation projects.

2. Subsidy policies in various cities. Xi'an City has also completed the formulation of the subsidy policy, which will be issued in the near future. Xi'an's subsidy method and quota are basically the same as those in the province. Previously, Shangluo City issued a subsidy policy (with a clear local protection policy), and other regions and cities have no local subsidy policy.

3. The subsidy brings about a shortened investment recovery period. With a subsidy of 1 yuan per watt, photovoltaic grid-connected projects in the Guanzhong region have reduced the payback period of nearly one year. If subsidy at both the provincial and municipal levels can be put in place, the solar grid-connected power generation system will be installed within the administrative region of Xi’an. Its revenue has increased significantly.

According to the above statistics of power generation, if the individual user applies for the full amount of Internet access, the static investment payback period is about 8 years. When the government subsidy can be obtained at the provincial and municipal levels, the payback period is reduced to 6 years. The life span of photovoltaic grid-connected power generation systems is based on 25 years (only a small amount of operation and maintenance costs exist when selecting large-scale plants and products certified by the state), and the investment income of their own photovoltaic grid-connected power plants is relatively optimistic.

4. Static investment income of personal home improvement projects

Calculate the personal project income by the full 10kw Internet access method as follows:

5. The efficiency of photovoltaic grid-connected projects of industrial and commercial enterprises is better. The national and local governments encourage industrial and commercial enterprises to build photovoltaic grid-connected power generation systems in the form of “spontaneous self-use and surplus electricity access.” Due to the high price of electricity used by enterprises, daytime power generation exactly offsets the high peak electricity prices during peak hours and peak days. Therefore, industrial and commercial enterprises use rooftops to install solar photovoltaic grid-connected power generation. The economy, environmental protection (energy saving and emission reduction), and social benefits are all outstanding. Its investment recovery period is also 1 to 2 years shorter than that of personal photovoltaic grid-connected projects.

2015 is the year of the “Twelfth Five-Year Plan”. The energy saving pressures of institutions and companies are large. Photovoltaic power generation investment has quick effect, no need to invest in equipment room, no land occupation, no complicated technology management, no need to increase management personnel. After one or two months of installation is completed, it will be immediately connected to the grid to generate electricity, directly from the source of energy saving, emission reduction, see benefits.

Calculated according to the installed capacity of 1mw, self-occupation, and surplus electricity access to corporate projects are as follows:

6. Enterprises with tight funds may choose to invest in third parties. Some companies and companies would like to build photovoltaic power generation but it is difficult to make decisions due to capital shortages, and it is a pity that the roof is idle. It is possible to lend roofs to professional photovoltaic or investment companies and build them by photovoltaic companies or third parties. Companies can collect a small amount of roof rent or press certain The use of new energy and green electricity as a way to reduce the price of electricity will directly benefit energy conservation and emission reduction after the project is run. Xi'an Bowei New Energy Lao Zhijun told the author that while collecting a large area of ​​free roof resources, it provides free technical solutions and profit analysis to corporate customers, allowing corporate customers to understand the photovoltaic power generation system and the situation after the operation in more detail. In terms of project construction, there are more and more flexible cooperation options to choose from. This gives enterprises and institutions the opportunity to use photovoltaic grid-connected power generation to save energy and reduce emissions, providing greater options.

7. Green buildings choose photovoltaic grid-connected power generation. The country’s new green building evaluation standard encourages the use of photovoltaic energy for energy conservation. In the green building identification evaluation score, the installed capacity of photovoltaic power generation accounts for different proportions of building energy consumption, and it will obtain the highest score of 10 points, which provides a more effective, faster, and simpler support means for the construction project to apply for the green standard.

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